A multi-path sensitive system

Abstract

The application relates to a multi-light-path sensitive system and belongs to the field of detection system design; the system comprises a mask unit, a laminated detection unit, a signal processing unit and an information acquisition unit; the signal processing unit comprises a sunlight detection conditioning module, a laser detection conditioning module and an electric signal processing module; the sunlight and the laser path in the mixed incident light are separated through the laminated detection unit, and are converted into sunlight digital signals and laser digital signals; the sunlight incident direction is calculated according to the sunlight digital signals; the laser incident direction is calculated according to the laser digital signals; and the sunlight incident direction and the laser incident direction are sent to the information acquisition unit to complete measurement; the application simultaneously realizes sensitive measurement of sunlight and continuous laser, laser and sunlight adopt the same incident light channel, the volume is obviously reduced, and the weight is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of detection system design, and relates to a multi-light-path sensitive system. BACKGROUND

[0002] The sun sensor is an indispensable attitude measurement sensor of a satellite control subsystem, and can be used for sun orientation of a solar sail and sun capture of the whole satellite. The sun sensor generally has a large field of view. The laser sensor is an important sensor of a satellite environment sensing subsystem, and can realize laser detection in a large field of view. In the face of the problem of background light caused by the sun in space and stray light reflected by the satellite itself, the laser sensor needs to have a narrow-band filtering function for the target laser light source to meet the signal-to-noise ratio requirement.

[0003] Considering the constraint of the whole satellite resources, a multi-energy reuse measurement and sensing sensor is adopted, which can save weight, volume, power consumption and other resources of the whole satellite. The functions of the laser sensing and the sun sensing are fused, which has a strong application prospect.

[0004] In the main light guiding structure of the existing laser sensor, a wide-angle lens with a large field of view is used to guide light, a narrow-band filter is added at the end of the lens to realize narrow-band filtering of the target spectrum, and a detector is arranged at the rear end of the filter. Only the laser spectrum is measured, and the sunlight spectrum is filtered out, so the sunlight cannot be measured. The existing sun sensor measures the continuous spectrum of the sun, and the laser spectrum is contained in the sunlight spectrum, so the laser spectrum cannot be identified, and the laser cannot be measured. SUMMARY

[0005] The application solves the technical problem of overcoming the shortcomings of the prior art and providing a multi-light-path sensitive system, which simultaneously realizes sensitive measurement of sunlight and continuous laser. The laser and the sunlight use the same incident light channel, the volume is significantly reduced, and the weight is reduced.

[0006] The technical solution of the application is as follows:

[0007] The multi-light-path sensitive system comprises a mask unit, a laminated detection unit, a signal processing unit and an information acquisition unit. The signal processing unit comprises a sunlight detection conditioning module, a laser detection conditioning module and an electrical signal processing module.

[0008] The mask unit receives irradiation of mixed incident light composed of external sunlight and external laser, attenuates the mixed incident light, and transmits the mixed incident light to the laminated detection unit.

[0009] The laminated detection unit receives the mixed incident light transmitted from the mask unit, separates the sunlight and the laser light from the mixed incident light, converts the sunlight into a large sunlight current signal and the laser light into a laser current signal, and sends the sunlight current signal to the sunlight detection conditioning module and the laser to the laser detection conditioning module.

[0010] The sunlight detection conditioning module receives the sunlight current signal from the laminated detection unit, converts the sunlight current signal into a sunlight voltage signal, processes the sunlight voltage signal, generates a sunlight analog signal, and sends the sunlight analog signal to the electrical signal processing module.

[0011] The laser detection conditioning module receives the laser current signal from the laminated detection unit, converts the laser current signal into a laser voltage signal, processes the laser voltage signal, generates a laser analog signal, and sends the laser analog signal to the electrical signal processing module.

[0012] The electrical signal processing module receives the sunlight analog signal from the sunlight detection conditioning module, receives the laser analog signal from the laser detection conditioning module, converts the sunlight analog signal into a sunlight digital signal, converts the laser analog signal into a laser digital signal, calculates the sunlight incident direction according to the sunlight digital signal, calculates the laser incident direction according to the laser digital signal, and sends the sunlight incident direction and the laser incident direction to the information acquisition unit.

[0013] The information acquisition unit receives the sunlight incident direction and the laser incident direction from the electrical signal processing module and completes the measurement.

[0014] In the above-mentioned multi-light-path sensitive system, the mask unit realizes attenuation of the mixed incident light, and the transmittance of the mixed incident light with a wavelength of 400-1100 nm is 5%; the mask unit is in a square plate structure; and a square light hole is arranged at the center of the mask unit.

[0015] In the above-mentioned multi-light-path sensitive system, the laminated detection unit includes two vertically stacked detectors; the upper detector realizes absorption of the sunlight and converts the sunlight into a sunlight current signal; the lower detector realizes absorption of the laser light and converts the laser light into a laser current signal; and the top of the upper detector and the lower detector is equally divided into four quadrants.

[0016] In the above-mentioned multi-light-path sensitive system, the detection wavelength of the sunlight is less than or equal to 1 μm; and the detection wavelength of the laser light is greater than 1 μm and not greater than 1.1 μm.

[0017] In the multi-light-path sensitive system, the sunlight detection conditioning module converts the sunlight current signal into a sunlight voltage signal through transimpedance amplification, and performs gain conditioning on the sunlight voltage signal, and the gain value is a fixed value of 1000.

[0018] In the multi-light-path sensitive system, the laser detection conditioning module converts the laser current signal into a laser voltage signal through transimpedance amplification, and performs gain conditioning on the laser voltage signal, and the gain range is 10-6000.

[0019] In the multi-light-path sensitive system, the sunlight incident direction includes the pitch angle α of the sunlight direction vector 太阳 and the yaw angle β of the laser direction vector 太阳 .

[0020] In the multi-light-path sensitive system, the α 太阳 and the β 太阳 are calculated by the following method:

[0021]

[0022] In the formula, I 顶1 is the sunlight current output by the first quadrant of the upper detector;

[0023] I 顶2 is the sunlight current output by the second quadrant of the upper detector;

[0024] I 顶3 is the sunlight current output by the third quadrant of the upper detector;

[0025] I 顶4 is the sunlight current output by the fourth quadrant of the upper detector;

[0026] d is the projection side length of the light hole of the mask unit on the upper detector;

[0027] b is the interval between each quadrant of the upper detector;

[0028] h 顶层探测器 is the interval between the mask unit and the upper detector.

[0029] In the multi-light-path sensitive system, the laser incident direction includes the pitch angle α of the laser direction vector 激光 and the yaw angle β of the sunlight direction vector 激光 .

[0030] In the multi-light-path sensitive system, the α 激光 and the β 激光 are calculated by the following method:

[0031]

[0032] In the formula, I 底1 is the laser current output by the first quadrant of the lower detector;

[0033] I 底2 is the laser current output by the second quadrant of the lower detector;

[0034] I 底3 is the laser current output by the third quadrant of the lower detector;

[0035] I 底4 is the laser current output by the fourth quadrant of the lower detector;

[0036] d is the projection side length of the light hole of the mask unit on the lower detector;

[0037] b is the interval between the quadrants of the lower detector;

[0038] h 底层探测器 is the interval between the mask unit and the lower detector.

[0039] The beneficial effects of the present application compared with the prior art are:

[0040] (1) The present application realizes the smooth entry of common-path light into the stacked detection unit through the attenuation film system of the mask unit; at the same time, through the design of the top detector and the bottom detector, the measurement of sunlight and laser is realized respectively;

[0041] (2) The present application converts the sunlight current signal into a sunlight voltage signal through the sunlight detection conditioning module, and processes the sunlight voltage signal to generate a sunlight analog signal; through the laser detection conditioning module, the laser current signal is converted into a laser voltage signal, and the laser voltage signal is processed to generate a laser analog signal, realizing the initial conversion of the sunlight and laser measurement;

[0042] (3) The electric signal processing module of the present application converts the sunlight analog signal into a sunlight digital signal; converts the laser analog signal into a laser digital signal; and calculates the sunlight incident direction and the laser incident direction according to the sunlight and laser digital signals respectively, finally realizing the branch measurement of the mixed incident light. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is the schematic diagram of the multi-light-path sensitive system of the present application. DETAILED DESCRIPTION

[0044] The present application will be further described below in conjunction with examples.

[0045] The application provides a multi-light-path sensitive system, which simultaneously realizes sensitive measurement of sunlight and continuous laser after receiving irradiation of mixed incident light composed of external sunlight and external laser, and uses the same incident light channel for laser and sunlight, thereby significantly reducing volume and weight.

[0046] The multi-light-path sensitive system comprises a mask unit, a laminated detection unit, a signal processing unit and an information acquisition unit. Figure 1 The signal processing unit comprises a sunlight detection conditioning module, a laser detection conditioning module and an electrical signal processing module.

[0047] The mask unit receives irradiation of mixed incident light composed of external sunlight and external laser, attenuates the mixed incident light and then transmits the mixed incident light to the laminated detection unit.

[0048] The wavelength of the sunlight is less than or equal to 1 μm, and the wavelength of the laser is greater than 1 μm and less than or equal to 1.1 μm.

[0049] The laminated detection unit receives the mixed incident light transmitted from the mask unit, separates the sunlight and the laser from the mixed incident light, converts the sunlight into a large sunlight current signal and converts the laser into a laser current signal, and sends the sunlight current signal to the sunlight detection conditioning module and sends the laser to the laser detection conditioning module.

[0050] The laminated detection unit comprises two vertically stacked detectors, the upper detector absorbs the sunlight and converts the sunlight into a sunlight current signal, and the lower detector absorbs the laser and converts the laser into a laser current signal.

[0051] The sunlight detection conditioning module receives the sunlight current signal from the laminated detection unit, converts the sunlight current signal into a sunlight voltage signal, processes the sunlight voltage signal, generates a sunlight analog signal and sends the sunlight analog signal to the electrical signal processing module.

[0052] The laser detection conditioning module receives the laser current signal from the laminated detection unit, converts the laser current signal into a laser voltage signal, processes the laser voltage signal, generates a laser analog signal and sends the laser analog signal to the electrical signal processing module.

[0053] The sunlight detection conditioning module converts the sunlight current signal into a sunlight voltage signal through transimpedance amplification, and performs gain conditioning on the sunlight voltage signal, with a gain value of 1000 fixed value.

[0054] The laser detection conditioning module converts the laser current signal into a laser voltage signal through transimpedance amplification, and performs gain conditioning on the laser voltage signal, with a gain range of 10-6000.

[0055] The electrical signal processing module receives the sunlight analog signal transmitted by the sunlight detection conditioning module, receives the laser analog signal transmitted by the laser detection conditioning module, converts the sunlight analog signal into a sunlight digital signal, converts the laser analog signal into a laser digital signal, calculates the sunlight incident direction according to the sunlight digital signal, calculates the laser incident direction according to the laser digital signal, and transmits the sunlight incident direction and the laser incident direction to the information acquisition unit.

[0056] The information acquisition unit receives the sunlight incident direction and the laser incident direction transmitted by the electrical signal processing module, and completes the measurement.

[0057] The specific calculation method is as follows:

[0058] The sunlight incident direction includes the pitch angle α 太阳 and the yaw angle β 太阳 of the sun direction vector. The calculation method of α 太阳 and β 太阳 is as follows:

[0059]

[0060] In the formula, I 顶1 is the sunlight current output by the first quadrant of the upper detector;

[0061] I 顶2 is the sunlight current output by the second quadrant of the upper detector;

[0062] I 顶3 is the sunlight current output by the third quadrant of the upper detector;

[0063] I 顶4 is the sunlight current output by the fourth quadrant of the upper detector;

[0064] d is the projection side length of the light hole of the mask unit on the upper detector;

[0065] b is the interval between each quadrant of the upper detector;

[0066] h 顶层探测器 is the distance between the mask unit and the upper detector.

[0067] The laser incidence direction includes the pitch angle a of the laser direction vector 激光 and the yaw angle b of the laser direction vector 激光 . a 激光 and b 激光 The calculation method is as follows:

[0068]

[0069] In the formula, I 底1 is the laser current output by the first quadrant of the detector located below;

[0070] I 底2 is the laser current output by the second quadrant of the detector located below;

[0071] I 底3 is the laser current output by the third quadrant of the detector located below;

[0072] I 底4 is the laser current output by the fourth quadrant of the detector located below;

[0073] d is the projection side length of the light hole of the mask unit on the detector located below;

[0074] b is the interval between each quadrant of the detector located below;

[0075] h 底层探测器 is the interval between the mask unit and the detector located below.

[0076] Further, the present application can inversely solve the photoelectric current generated by sunlight on the bottom detector by calculating the solar direction angle, and is used for compensating the laser photoelectric current output by the bottom detector. The calculation method of the photoelectric current generated by sunlight on the bottom detector is as follows:

[0077]

[0078] In the formula, C is a constant, and the value is the solar photoelectric current value output by the single quadrant of the bottom detector when the sun is directly irradiated.

[0079] The target power value of the laser can be obtained by calculating the sum of the laser currents of the four quadrants of the bottom detector. The calculation method is as follows:

[0080]

[0081] R 1000nm～1100nm responsivity of the bottom detector in the range of 1000 nm-1100 nm;

[0082] T 掩膜 transmittance of the light hole of the mask unit.

[0083] The application realizes the common path light attenuation processing through the layering of the mask unit, and then smoothly enters the laminated detection unit; meanwhile, through the design of the top layer detector and the bottom layer detector, the solar light and the laser are measured respectively.

[0084] The application converts the sunlight current signal into a sunlight voltage signal through the sunlight detection conditioning module, and processes the sunlight voltage signal to generate a sunlight analog signal; converts the laser current signal into a laser voltage signal through the laser detection conditioning module, and processes the laser voltage signal to generate a laser analog signal, thereby realizing the initial conversion of the sunlight and laser measurement.

[0085] The electric signal processing module of the application converts the sunlight analog signal into a sunlight digital signal; converts the laser analog signal into a laser digital signal; and calculates the sunlight incident direction and the laser incident direction according to the sunlight digital signal, thereby finally realizing the branch measurement of the mixed incident light.

[0086] Although the application has been disclosed as above with the preferred embodiments, it is not intended to limit the application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the application by using the disclosed methods and technical contents without departing from the spirit and scope of the application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the application, which does not depart from the technical solutions of the application, shall fall within the protection scope of the technical solutions of the application.

Claims

1. A multi-path sensitive system, characterized by: The device comprises a mask unit, a laminated detection unit, a signal processing unit and an information acquisition unit; the signal processing unit comprises a sunlight detection conditioning module, a laser detection conditioning module and an electrical signal processing module; The mask unit receives the mixed incident light composed of external sunlight and external laser and irradiates; after attenuating the mixed incident light, the mixed incident light is transmitted to the laminated detection unit; The laminated detection unit receives the mixed incident light transmitted from the mask unit; separates the sunlight and laser from the mixed incident light; converts the sunlight into a large sunlight current signal and converts the laser into a laser current signal; and sends the sunlight current signal to the sunlight detection conditioning module and sends the laser to the laser detection conditioning module; The sunlight detection conditioning module receives the sunlight current signal from the laminated detection unit, converts the sunlight current signal into a sunlight voltage signal, processes the sunlight voltage signal, generates a sunlight analog signal, and sends the sunlight analog signal to the electrical signal processing module; The laser detection conditioning module receives the laser current signal from the laminated detection unit, converts the laser current signal into a laser voltage signal, processes the laser voltage signal, generates a laser analog signal, and sends the laser analog signal to the electrical signal processing module; The electrical signal processing module receives the sunlight analog signal from the sunlight detection conditioning module, receives the laser analog signal from the laser detection conditioning module, converts the sunlight analog signal into a sunlight digital signal, converts the laser analog signal into a laser digital signal, calculates the sunlight incident direction according to the sunlight digital signal, calculates the laser incident direction according to the laser digital signal, and sends the sunlight incident direction and the laser incident direction to the information acquisition unit; The information acquisition unit receives the sunlight incident direction and the laser incident direction from the electrical signal processing module and completes the measurement.

2. The multi-optical-path sensitive system according to claim 1, wherein: The mask unit attenuates the mixed incident light, and the transmittance of the mixed incident light with a wavelength of 400-1100 nm is 5%; the mask unit is a square plate structure; the center of the mask unit is provided with a square light hole.

3. A multiple light path sensing system according to claim 2, wherein: The laminated detection unit comprises two vertically stacked detectors; the upper detector absorbs sunlight and converts it into a sunlight current signal; the lower detector absorbs laser and converts it into a laser current signal; the top of the upper detector and the lower detector is equally divided into four quadrants.

4. A multiple light path sensing system according to claim 3, wherein: The detection wavelength of the sunlight is less than or equal to 1 μm; the detection wavelength of the laser is greater than 1 μm and not greater than 1.1 μm.

5. The multi-optical-path sensitive system of claim 1, wherein: The sunlight detection conditioning module converts the sunlight current signal into a sunlight voltage signal through transimpedance amplification and processes the sunlight voltage signal with a gain of 1000 fixed value.

6. The multi-optical-path sensing system of claim 1, wherein: The laser detection conditioning module converts the laser current signal into a laser voltage signal through transimpedance amplification and processes the laser voltage signal with a gain ranging from 10 to 6000.

7. The multi-optical-path sensitive system of claim 3, wherein: The sunlight incident direction includes an elevation angle a of a sun direction vector 太阳 and a yaw angle β of a laser direction vector 太阳 .

8. A multiple light path sensing system according to claim 7, wherein: The α 太阳 and β 太阳 calculation method is: where I 顶1 is the solar photocurrent output from the first quadrant of the overhead detector; I 顶2 a solar photocurrent output for the second quadrant of the detector located above; I 顶3 a solar photocurrent output for the third quadrant of the detector located above; I 顶4 a solar photocurrent output for the fourth quadrant of the overhead detector; d is the projection length of the light hole of the mask unit on the upper detector; b is the spacing between the quadrants of the upper detector; h 顶层探测器 is the spacing between the mask unit and the detector located below.

9. The multi-optical-path sensitive system of claim 3, wherein: The laser incidence direction includes a pitch angle a of the laser direction vector 激光 and a yaw angle β of the laser direction vector 激光 .

10. The multi-optical-path sensing system of claim 9, wherein: The α 激光 and β 激光 calculation method is: wherein I 底1 is the laser current output for the first quadrant of the detector located below; I 底2 laser current output for the second quadrant of the detector below; I 底3 laser current output for the third quadrant of the detector below; I 底4 laser current output for the fourth quadrant of the detector below; d' is the projected side length of the mask unit aperture on the lower detector; b' is the spacing between the quadrants of the lower detector; h 底层探测器 is the spacing between the mask unit and the detector located below.

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